Related Experiment Videos
Platelet-derived growth factor-A and its receptor are expressed in separate, but adjacent cell layers of the mouse
1Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.
Abstract:
The localized developmental expression of murine platelet-derived growth factor A (PDGF-A) was compared to that of its receptor (Pdgfra). Our in situ hybridization study included germ layers of primitive streak embryos, early axial structures (dermatome, myotome, sclerotome, floor plate), the skin and some of its derivatives (hair and mammary gland), the developing forelimb, the branchial arches and various sense organs (otic vesicle, olfactory epithelium and the eye). We report that PDGF-A and Pdgfra are expressed in separate, but adjacent cell layers in these structures and that in most, the ligand is expressed in the epithelium, whereas the receptor in the mesenchyme. This localization corresponds to classical experimental evidence for developmental interactions across cell layers. We suggest that the spatio-temporal regulation of PDGF-A and Pdgfra, and other related systems, represents one model for the spatial regulation of receptor-ligand interactions.
Insights
Platelet-derived growth factor A (PDGF-A) and its receptor (Pdgfra) show distinct but adjacent expression patterns during embryonic development. This spatial regulation in epithelial and mesenchymal layers may model developmental cell interactions.
Area of Science:
- Developmental biology
- Molecular genetics
- Cell signaling
Background:
- Platelet-derived growth factor A (PDGF-A) and its receptor (Pdgfra) are crucial for embryonic development.
- Understanding their precise expression patterns is key to deciphering developmental signaling pathways.
Purpose of the Study:
- To compare the localized developmental expression of PDGF-A and its receptor, Pdgfra, in murine embryos.
- To investigate the spatial relationship between PDGF-A and Pdgfra expression in various developing tissues.
Main Methods:
- In situ hybridization was employed to analyze gene expression patterns.
- Expression was examined in a wide range of embryonic structures, including germ layers, axial structures, skin derivatives, limbs, branchial arches, and sense organs.
Main Results:
- PDGF-A and Pdgfra were found to be expressed in separate, yet adjacent, cell layers across numerous embryonic tissues.
- Typically, the PDGF-A ligand was localized to the epithelium, while the Pdgfra receptor was found in the adjacent mesenchyme.
Conclusions:
- The observed spatio-temporal expression patterns of PDGF-A and Pdgfra support their roles in mediating developmental interactions between epithelial and mesenchymal compartments.
- This distinct receptor-ligand localization provides a model for understanding spatial regulation in cell-cell communication during embryogenesis.